<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Promise animation</title>
    <style>
        .ball {
            width: 40px;
            height: 40px;
            border-radius: 20px;
        }

        .ball1 {
            background: red;
        }
        .ball2 {
            background: yellow;
        }
        .ball3 {
            background: green;
        }
    </style>
    <script src="bluebird/js/browser/bluebird.js"></script>
</head>
<body>
   <div class="ball ball1" style="margin-left: 0;"></div>
   <div class="ball ball2" style="margin-left: 0;"></div>
   <div class="ball ball3" style="margin-left: 0;"></div>
<script>
    var ball1 = document.querySelector('.ball1');
    var ball2 = document.querySelector('.ball2');
    var ball3 = document.querySelector('.ball3');

    function animate(ball, distance, cb) {
        setTimeout(function () {
            var marginLeft = parseInt(ball.style.marginLeft, 10);
            if(marginLeft === distance) {
                cb && cb();
            } else {
                if(marginLeft < distance) {
                    marginLeft++;
                } else {
                    marginLeft--;
                }

                ball.style.marginLeft = marginLeft + 'px';
                animate(ball, distance, cb);
            }
        }, 13);
    }

//    animate(ball1, 100, function () {
//        animate(ball2, 200, function () {
//            animate(ball3, 300, function () {
//                animate(ball3, 150, function () {
//                    animate(ball2, 150, function () {
//                        animate(ball1, 150, function () {
//
//                        })
//                    })
//                })
//            })
//        })
//    })
    var Promise = window.Promise;
    function promiseAnimate(ball, distance) {
        return new Promise(function (resolve, reject) {
            function _animate() {
                setTimeout(function () {
                    var marginLeft = parseInt(ball.style.marginLeft, 10);
                    if(marginLeft === distance) {
                        resolve();
                    } else {
                        if(marginLeft < distance) {
                            marginLeft++;
                        } else {
                            marginLeft--;
                        }

                        ball.style.marginLeft = marginLeft + 'px';
                        _animate();
                    }
                }, 13);
            }

            _animate();
        })
    }

    promiseAnimate(ball1, 100)
        .then(function () {
            return promiseAnimate(ball2, 200);
        })
        .then(function () {
            return promiseAnimate(ball3, 300);
        })
        .then(function () {
            return promiseAnimate(ball3, 150);
        })
        .then(function () {
            return promiseAnimate(ball2, 150);
        })
        .then(function () {
            return promiseAnimate(ball1, 150);
        })
</script>
</body>
</html>